Seperation of Iron, Aluminum, Calcium, and Magnesium from Phosphoric Acid

This work was started for the purpose of making a study of the separation of iron, aluminum, calcium, and magnesium in the presence of phosphoric acid and to test out some of the proposed methods for separation of these elements; and if possible to determine some practical method of analysis of a substance containing these elements, that will be rapid, and 1 have a fair degree of accuracy.